Malicious PDF — malware analysis report

Static analysis result for SHA-256 e67eaeab57cab385…

MALICIOUS

PDF

82.8 KB Created: 2021-09-10 21:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a8c4188aadac4249a1ea4dc43cbc7738 SHA-1: 2845f69877e2bb37a417c4f7f8bf5aa79825acc9 SHA-256: e67eaeab57cab3852a1a053e4d357f7b78113b04a17f79cab00d1f2716cf9fd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to various domains, some of which appear to be compromised CMS uploads or hosted on disposable domains. The presence of multiple external URIs and link farm characteristics strongly suggests the PDF is designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://tdfstore.it/file/lanidifefimurokev.pdf In PDF document text
    • http://vrieshorst.nl/images/uploads/file/74437413436.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210907153110.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/38704580493.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/kowexutafezexoted.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd04e18b1c---86021306367.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/fexifig.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613adfd5918b4---busofelojekadis.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/64596614067.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109101654103754.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310b0af1415---vizuponapomiwalifibejitew.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/69542753993.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/bipefinuwufe.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/69210724196.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/zebobimopepipefej.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/31184485192.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/9584844263.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/doget.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/74929126230.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/26222652190.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/17001478988.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/87027761081.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161379b29303a8---57443705413.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/nibuvapurariwibaduju.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/jopukudojiberi.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/3689729435.pdfIn PDF document text
    • http://armanetti.com/images/92783939207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+put+date+on+photos+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79A 10620 bytes
SHA-256: 059f8bfd510fb77b7039aac00cdcdde2dcc1160890a27dba44a47f49201a49ac
font_02_sfnt_off00010fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD8 17548 bytes
SHA-256: 4f81e11725b5d83dce250c90b1f321072c452f03559910e269901c020e7ca823